Driving device and driving method of plasma display panel, and plasma display apparatus

Abstract

A driving device drives a plasma display panel having a plurality of discharge cells at intersections of a plurality of scan electrodes and a plurality of sustain electrodes with a plurality of data electrodes by a sub-field method. A scan electrode drive circuit applies a first ramp waveform that drops from a first potential to a second potential to the plurality of scan electrodes in a first period in a setup period of a sub-field. A sustain electrode drive circuit applies a second ramp waveform that drops from a fourth potential to a fifth potential to the plurality of sustain electrodes when a potential detection circuit detects that the plurality of scan electrodes attain a third potential that is lower than the first potential and higher than the second potential in the first period.

1 . A driving device of a plasma display panel that drives the plasma display panel having a plurality of discharge cells at intersections of a plurality of scan electrodes and a plurality of sustain electrodes with a plurality of data electrodes by a sub-field method in which one field includes a plurality of sub-fields, comprising:
 a scan electrode drive circuit that drives said plurality of scan electrodes;   a sustain electrode drive circuit that drives said plurality of sustain electrodes; and   a potential detection circuit, wherein   said scan electrode drive circuit applies a first ramp waveform that drops from a first potential to a second potential to said plurality of scan electrodes in a first period in a setup period of at least one sub-field of said plurality of sub-fields,   said potential detection circuit detects that said plurality of scan electrodes attain a third potential that is lower than said first potential and higher than said second potential in said first period, and   said sustain electrode drive circuit applies a second ramp waveform that drops from a fourth potential to a fifth potential to said plurality of sustain electrodes in response to detection of said third potential by said potential detection circuit.   
     
     
         2 . The driving device of the plasma display panel according to  claim 1 , wherein said sustain electrode drive circuit brings said plurality of sustain electrodes into a floating state in response to the detection of said third potential by said potential detection circuit. 
     
     
         3 . The driving device of the plasma display panel according to  claim 1 , wherein
 said potential detection circuit generates a switching signal in a period, in which a potential of said plurality of scan electrodes drops from said third potential to said second potential, in said first period, and   said sustain electrode drive circuit applies said second ramp waveform to said plurality of sustain electrodes in the period in which said switching signal is generated.   
     
     
         4 . The driving device of the plasma display panel according to  claim 1 , wherein said sustain electrode drive circuit holds said plurality of sustain electrodes at said fourth potential in a write period of the at least one sub-field of said plurality of sub-fields. 
     
     
         5 . A driving method of a plasma display panel that drives the plasma display panel having a plurality of discharge cells at intersections of a plurality of scan electrodes and a plurality of sustain electrodes with a plurality of data electrodes by a sub-field method in which one field includes a plurality of sub-fields, comprising the steps of:
 applying a first ramp waveform that drops from a first potential to a second potential to said plurality of scan electrodes in a first period in a setup period of at least one sub-field of said plurality of sub-fields,   detecting that said plurality of scan electrodes attain a third potential that is lower than said first potential and higher than said second potential in said first period, and   applying a second ramp waveform that drops from a fourth potential to a fifth potential to said plurality of sustain electrodes in response to detection of said third potential.   
     
     
         6 . A plasma display apparatus comprising:
 a plasma display panel having a plurality of discharge cells at intersections of a plurality of scan electrodes and a plurality of sustain electrodes with a plurality of data electrodes; and   a driving device that drives said plasma display panel by a sub-field method in which one field includes a plurality of sub-fields, wherein   said driving device includes:   a scan electrode drive circuit that drives said plurality of scan electrodes;   a sustain electrode drive circuit that drives said plurality of sustain electrodes; and   a potential detection circuit,   said scan electrode drive circuit applies a first ramp waveform that drops from a first potential to a second potential to said plurality of scan electrodes in a first period in a setup period of at least one sub-field of said plurality of sub-fields,   said potential detection circuit detects that said plurality of scan electrodes attain a third potential that is lower than said first potential and higher than said second potential in said first period, and   said sustain electrode drive circuit applies a second ramp waveform that drops from a fourth potential to a fifth potential to said plurality of sustain electrodes in response to detection of said third potential by said potential detection circuit.